Improvement in polishing-machines



SAMUELBEVAN. Improvement in Polishing-Machines. No. 114,098.

Patented April 25 1871.

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SAMUEL BEVAN, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO HENRY DISSTON &SON, OF SAME PLACE.

Letters Patent No. 114,098, dated April 25 1871.

. IMPROVEMENT IN POLISHING-MACHINES.

The Schedule referred to in. these Letters Patent and mixing pan: of thename.

I, SAMUEL BEVAN, of Philadelphia, county of Philadelphia, State ofPennsylvania, have invented certain Mechanism. for Polishing Saw-Blades,of which the following is a specification.

Nature and Object of the Invention.

Figure 5, a view showinga modification of my invention.

General Description.

A and A are the opposite side frames of the machine, and are connectedtogether at suitable points by transverse rods'a a.

B is a shaft, turning in suit-able bearings at the top of the sideframes A and A, and to this shaft is secured a polishing-wheel orgrindstone, G, and a pulley, D, for receiving a driving-belt.

E is a spindle, turning in bearings c e, which are arranged to slide invertical guides, g g, secured to the horizontal portion A of theside'frames, the said bear ings resting npon springs composed of rubberblocks, (Z d, which, together with the bearings, can be adjustedvertically by a set-screw, s, the 'ends of the latter hearing againstplates or'washers, h, beneath the said blocks.

To the spindle E are loosely hung two levers, F F, the long arms f f ofwhich are furnished with adj ustable weights, W W, and to the short armsf" f are attached, by means of swivel-joints t, bearings o" 'r, for thespindle of -a roller, B, clothed with rubber or other suitable yieldingmaterial.

Strips of metal, t, bent to the staple-like form shown in fig. 2, arehooked to one of the transverse. rods c, and serve to limit the downwardmovement 0 the long arms of the levers F F. I

The saw-blade or other article of thin steel is placed on a strip, :0,of wood, and an operator holds this strip so that it shall bear on theroller while the blade ispressed upward .again'st the polishing-wheelwith a force limited by the weighted arms; in fact, the strip, with itsblade, is a lever resting on the roller R, as a fulcrum, yielding to agreater pressure than is necessary to polish the blade.

As the wheel revolves in the direction of the arrow the strip, with itsblade, is carried forward as far and as fast as the operator willpermit, and is then drawn back, and this is continued until the blade iscompletely polished by the wheel and theemery or other polishingmaterial which may be used in conjunction with it, a uniformly-polishedsurface being imparted to the blade owingto the yielding fulcrum.

After the strip and blade have been withdrawn from between the roller Rand the wheel the weighted levers F F will fall until arrested in theirdescent by the slots t, which prevent the roller from coming in contactwith the wheel.

It has been before remarked that the levers F F are hung loosely on thespindle E, and that the bear-.

levers F F and their weights may be dispensed with and the spindle ofthe fulcrum-roller may revolve in bearings adapted to the guides g g',and resting on rub- 1 her blocks or other equivalent springs.

It will be seen that the feeding-roller R is not placed directly belowthe axis of the wheel 0. By this means a space is always left betweenthe two for the introduction of the hand-board and the saw-plate carriedby the same. roller is level with the lowest part of the wheel 0,

the plate, however thin it may be, is carried up against the wheel, andmay be pressed against the latter with ant required force.

Claim.

The combination, with the revolving polishingwheel 0, of a yieldingroller,- R, arranged below the wheel at one side of a vertical linedrawn through the axis of thelatter, so as to form the fulcrum of aboard carrying the plate to be polished, as set forth.

In' testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

SAMUEL BEVAN.

Witnesses:

A. H. SHOEMAKER, ARTHUR J. Coons.

As the upper surface of the

